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Pickled Onions

Pickled onions preserved in a vinegar, ginger, and peppercorn brine.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Onion and ginger are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 7,595 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Pickled Onions

Ingredients

Directions

Brine the onions

  1. Peel the onions.

  2. Boil a strong solution of salt and water, then pour it over the onions.

  3. Cover the vessel to retain steam and let it stand for 24 hours.

Dry and pickle

  1. After 24 hours, wipe the onions dry.

  2. Boil the vinegar, peppercorns, and ginger together.

  3. Pour the hot mixture over the onions, ensuring they are fully submerged.

Store

  1. Seal the container tightly and store for several weeks before use.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Onion + gingertop 9% of all pairs
    Smell alikemoderate
    Cooked together7,595 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Onion + vinegartop 14% of all pairs
    Smell alikemoderate
    Cooked together18,226 recipes

    Shared aroma: acetic acid (sour, vinegar).

  3. Ginger + vinegartop 19% of all pairs
    Smell alikemoderate
    Cooked together5,126 recipes

    Shared aroma: isoamyl acetate (banana, pear).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Onions
The main vegetable, which softens in the brine and turns tender and crisp-edged once pickled.
Vinegar
Provides acidity that preserves the onions and gives them their sharp, tangy flavour.
Ginger
Adds warm, aromatic spice that flavours the pickling liquid.
Peppercorns
Contribute pungent, aromatic heat that infuses into the hot vinegar.

The step that matters

Keeping the onions fully submerged in the vinegar. Any onion pieces left above the liquid are exposed to air, which invites mould and spoilage. Full coverage by the acidic liquid keeps the onions preserved during storage.

Swap the ginger

How well each one fits the dish's main ingredients (onion, vinegar):

  1. Garlicfits better
  2. Tarragonfits better
  3. Thymefits better
  4. Gingerthe original

Fit is the average pairing score against onion, vinegar. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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